Refrigerant Circuit (Heat Pump Operating Principle; Water Circuit; Safety Devices - Dimplex AWP 30 HLW Installation And Operating Instructions Manual

2.2 Refrigerant Circuit (Heat Pump
Operating Principle)
The refrigerant circuit is a closed-loop system in which the refrig-
erant R134a is the energy source. The finned heat exchanger ex-
tracts heat from the air taken in at a low evaporation temperature,
and transfers it to the refrigerant. The vapourous refrigerant is
sucked in by a compressor where it is compressed to a higher
pressure and temperature level before being transported to the
liquifier, where the heat taken up in the evaporator and part of the
compressing energy, is transferred to the water. Subsequently,
the high condensation pressure is lowered to the evaporation
pressure via a throttle mechanism (expansion valve). In the
evaporator, the refrigerant will again take up heat from the air
that is sucked in.

2.3 Water Circuit

The hot-water heat pump water circuits depend on the pump type
(with or without internal heat exchanger). They must be installed
on site. The water connections (see illustration) are at the rear of
the unit.
Important information:
Circulation pipe
For energy efficiency reasons, the circulation pipe circuit
type should not be used. When installing a circulation pipe in
the hot water distribution system, provide a valve or a similar
device as shut-off facility. Circulation is enabled according to
use (time or requirement control).
Condensate outflow
See Point 7.2 "Connecting the Condensed Water Pipe"
1) Alternative condensate hose routing
* Nominal width of air duct connection DN 160 ⇒ outer diameter
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2.4 Safety Devices

The hot-water heat pump has the following safety features:
High-pressure switch
The high-pressure switch protects the heat pump against imper-
missibly high operating pressure in the refrigerant circuit. In the
event of fault, the pressure switch will switch off the heat pump.
The heat pump is restarted automatically if there has been a
pressure drop in the refrigerant circuit.
Safety temperature limiter for heating element
(STL)
The STL protects the hot-water installation against impermissible
temperature increases.
It is fixed to the control room panel and the corresponding sensor
is located in the dip pipe of the heating element.
The heating element is switched off if the set switching value
(99 °C) is exceeded.
The heating element cannot be re-started until the hot-water tem-
perature has decreased to ≤ 90 °C and the reset button (Fig. 2)
on the STL is pressed.
(This may be done by qualified personnel only!)
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2.4
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